<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>mainwindow.cpp 示例文件 | Qt Widgets 5.12.3</title>
  <link rel="stylesheet" type="text/css" href="style/offline-simple.css" />
  <script type="text/javascript">
    document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css");
    // loading style sheet breaks anchors that were jumped to before
    // so force jumping to anchor again
    setTimeout(function() {
        var anchor = location.hash;
        // need to jump to different anchor first (e.g. none)
        location.hash = "#";
        setTimeout(function() {
            location.hash = anchor;
        }, 0);
    }, 0);
  </script>
</head>
<body>
<div class="header" id="qtdocheader">
  <div class="main">
    <div class="main-rounded">
      <div class="navigationbar">
        <table><tr>
<td ><a href="../qtdoc/index.html">Qt 5.12</a></td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-itemviews-chart-example.html">Chart Example</a></td><td >mainwindow.cpp 示例文件</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.3 参考指南</a></td>
        </tr></table>
      </div>
    </div>
<div class="content">
<div class="line">
<div class="content mainContent">
<div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">mainwindow.cpp 示例文件</h1>
<span class="subtitle">itemviews/chart/mainwindow.cpp</span>
<!-- $$$itemviews/chart/mainwindow.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;pieview.h&quot;</span>
  <span class="preprocessor">#include &quot;mainwindow.h&quot;</span>

  <span class="preprocessor">#include &lt;QtWidgets&gt;</span>

  MainWindow<span class="operator">::</span>MainWindow(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
      : <span class="type"><a href="qmainwindow.html">QMainWindow</a></span>(parent)
  {
      <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>fileMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">&quot;&amp;File&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
      <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>openAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;&amp;Open...&quot;</span>));
      openAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Open);
      <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>saveAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;&amp;Save As...&quot;</span>));
      saveAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>SaveAs);
      <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>quitAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;E&amp;xit&quot;</span>));
      quitAction<span class="operator">-</span><span class="operator">&gt;</span>setShortcuts(<span class="type"><a href="../qtgui/qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit);

      setupModel();
      setupViews();

      connect(openAction<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWindow<span class="operator">::</span>openFile);
      connect(saveAction<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&amp;</span>MainWindow<span class="operator">::</span>saveFile);
      connect(quitAction<span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>triggered<span class="operator">,</span> <a href="qapplication.html#qApp">qApp</a><span class="operator">,</span> <span class="operator">&amp;</span><span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>quit);

      menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(fileMenu);
      statusBar();

      loadFile(<span class="string">&quot;:/Charts/qtdata.cht&quot;</span>);

      setWindowTitle(tr(<span class="string">&quot;Chart&quot;</span>));
      resize(<span class="number">870</span><span class="operator">,</span> <span class="number">550</span>);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>setupModel()
  {
      model <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtgui/qstandarditemmodel.html">QStandardItemModel</a></span>(<span class="number">8</span><span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="keyword">this</span>);
      model<span class="operator">-</span><span class="operator">&gt;</span>setHeaderData(<span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> tr(<span class="string">&quot;Label&quot;</span>));
      model<span class="operator">-</span><span class="operator">&gt;</span>setHeaderData(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Horizontal<span class="operator">,</span> tr(<span class="string">&quot;Quantity&quot;</span>));
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>setupViews()
  {
      <span class="type"><a href="qsplitter.html">QSplitter</a></span> <span class="operator">*</span>splitter <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsplitter.html">QSplitter</a></span>;
      <span class="type"><a href="qtableview.html">QTableView</a></span> <span class="operator">*</span>table <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtableview.html">QTableView</a></span>;
      pieChart <span class="operator">=</span> <span class="keyword">new</span> PieView;
      splitter<span class="operator">-</span><span class="operator">&gt;</span>addWidget(table);
      splitter<span class="operator">-</span><span class="operator">&gt;</span>addWidget(pieChart);
      splitter<span class="operator">-</span><span class="operator">&gt;</span>setStretchFactor(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
      splitter<span class="operator">-</span><span class="operator">&gt;</span>setStretchFactor(<span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);

      table<span class="operator">-</span><span class="operator">&gt;</span>setModel(model);
      pieChart<span class="operator">-</span><span class="operator">&gt;</span>setModel(model);

      <span class="type"><a href="../qtcore/qitemselectionmodel.html">QItemSelectionModel</a></span> <span class="operator">*</span>selectionModel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qitemselectionmodel.html">QItemSelectionModel</a></span>(model);
      table<span class="operator">-</span><span class="operator">&gt;</span>setSelectionModel(selectionModel);
      pieChart<span class="operator">-</span><span class="operator">&gt;</span>setSelectionModel(selectionModel);

      <span class="type"><a href="qheaderview.html">QHeaderView</a></span> <span class="operator">*</span>headerView <span class="operator">=</span> table<span class="operator">-</span><span class="operator">&gt;</span>horizontalHeader();
      headerView<span class="operator">-</span><span class="operator">&gt;</span>setStretchLastSection(<span class="keyword">true</span>);

      setCentralWidget(splitter);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>openFile()
  {
      <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> fileName <span class="operator">=</span>
          <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getOpenFileName(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Choose a data file&quot;</span>)<span class="operator">,</span> <span class="string">&quot;&quot;</span><span class="operator">,</span> <span class="string">&quot;*.cht&quot;</span>);
      <span class="keyword">if</span> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty())
          loadFile(fileName);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>loadFile(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>fileName)
  {
      <span class="type"><a href="../qtcore/qfile.html">QFile</a></span> file(fileName);
      <span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>ReadOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>Text))
          <span class="keyword">return</span>;

      <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> stream(<span class="operator">&amp;</span>file);

      model<span class="operator">-</span><span class="operator">&gt;</span>removeRows(<span class="number">0</span><span class="operator">,</span> model<span class="operator">-</span><span class="operator">&gt;</span>rowCount(<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>());

      <span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">while</span> (<span class="operator">!</span>stream<span class="operator">.</span>atEnd()) {
          <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> line <span class="operator">=</span> stream<span class="operator">.</span>readLine();
          <span class="keyword">if</span> (<span class="operator">!</span>line<span class="operator">.</span>isEmpty()) {
              model<span class="operator">-</span><span class="operator">&gt;</span>insertRows(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>());

              <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> pieces <span class="operator">=</span> line<span class="operator">.</span>split(<span class="char">','</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>SkipEmptyParts);
              <span class="keyword">if</span> (pieces<span class="operator">.</span>size() <span class="operator">&lt;</span> <span class="number">3</span>)
                  <span class="keyword">continue</span>;
              model<span class="operator">-</span><span class="operator">&gt;</span>setData(model<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span>
                             pieces<span class="operator">.</span>value(<span class="number">0</span>));
              model<span class="operator">-</span><span class="operator">&gt;</span>setData(model<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span>
                             pieces<span class="operator">.</span>value(<span class="number">1</span>));
              model<span class="operator">-</span><span class="operator">&gt;</span>setData(model<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span>
                             <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span>(pieces<span class="operator">.</span>value(<span class="number">2</span>))<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DecorationRole);
              row<span class="operator">+</span><span class="operator">+</span>;
          }
      };

      file<span class="operator">.</span>close();
      statusBar()<span class="operator">-</span><span class="operator">&gt;</span>showMessage(tr(<span class="string">&quot;Loaded %1&quot;</span>)<span class="operator">.</span>arg(fileName)<span class="operator">,</span> <span class="number">2000</span>);
  }

  <span class="type">void</span> MainWindow<span class="operator">::</span>saveFile()
  {
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getSaveFileName(<span class="keyword">this</span><span class="operator">,</span>
          tr(<span class="string">&quot;Save file as&quot;</span>)<span class="operator">,</span> <span class="string">&quot;&quot;</span><span class="operator">,</span> <span class="string">&quot;*.cht&quot;</span>);

      <span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty())
          <span class="keyword">return</span>;

      <span class="type"><a href="../qtcore/qfile.html">QFile</a></span> file(fileName);
      <span class="keyword">if</span> (<span class="operator">!</span>file<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>WriteOnly <span class="operator">|</span> <span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>Text))
          <span class="keyword">return</span>;

      <span class="type"><a href="../qtcore/qtextstream.html">QTextStream</a></span> stream(<span class="operator">&amp;</span>file);
      <span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator">&lt;</span> model<span class="operator">-</span><span class="operator">&gt;</span>rowCount(<span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>()); <span class="operator">+</span><span class="operator">+</span>row) {

          <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> pieces;

          pieces<span class="operator">.</span>append(model<span class="operator">-</span><span class="operator">&gt;</span>data(model<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span>
                                    <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DisplayRole)<span class="operator">.</span>toString());
          pieces<span class="operator">.</span>append(model<span class="operator">-</span><span class="operator">&gt;</span>data(model<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span>
                                    <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DisplayRole)<span class="operator">.</span>toString());
          pieces<span class="operator">.</span>append(model<span class="operator">-</span><span class="operator">&gt;</span>data(model<span class="operator">-</span><span class="operator">&gt;</span>index(row<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="type"><a href="../qtcore/qmodelindex.html">QModelIndex</a></span>())<span class="operator">,</span>
                                    <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>DecorationRole)<span class="operator">.</span>toString());

          stream <span class="operator">&lt;</span><span class="operator">&lt;</span> pieces<span class="operator">.</span>join(<span class="char">','</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;\n&quot;</span>;
      }

      file<span class="operator">.</span>close();
      statusBar()<span class="operator">-</span><span class="operator">&gt;</span>showMessage(tr(<span class="string">&quot;Saved %1&quot;</span>)<span class="operator">.</span>arg(fileName)<span class="operator">,</span> <span class="number">2000</span>);
  }

</pre>
</div>
<!-- @@@itemviews/chart/mainwindow.cpp -->
        </div>
       </div>
   </div>
   </div>
</div>
<div class="footer">
   <p>
   <acronym title="Copyright">&copy;</acronym> 2019 The Qt Company Ltd.
   Documentation contributions included herein are the copyrights of
   their respective owners.<br/>    The documentation provided herein is licensed under the terms of the    <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation    License version 1.3</a> as published by the Free Software Foundation.<br/>    Qt and respective logos are trademarks of The Qt Company Ltd.     in Finland and/or other countries worldwide. All other trademarks are property
   of their respective owners. </p>
</div>
</body>
</html>
